In this section, we provide a solution to the combined state estimation and uplink signal detection problem defined in (REF ), by applying factor graphs and GBP framework. In fact, for both constituent scenarios: the conventional state estimation (in case of power systems) and the uplink signal detection in C-RAN, the GBP has already been proposed and analyzed (see details in [1]} and [2]}). Thus in this work, we propose using GBP in a joint and combined setup of extracting the system state directly from the observed C-RAN signals.
